JP2010514983A - Circular motion piston machine - Google Patents

Abstract

The machine has a circular cylinder (1), which is curved along a partial circular arc, where a piston (2) is movably supported in a fluid, which mediates a movement. The piston is coupled by a lever (5) with a shaft (7), which is arranged coaxially in a center of the circular arc with its rotational axis. The lever is guided in a radial direction from the piston to the shaft through a gap, which is sealed and inserted in a wall of the circular cylinder in a movement direction of the piston.

Description

  The present invention is a circular motion piston machine provided with at least one annular passage curved along at least a partial arc, in which the piston is connected via one fluid connection. And is movably supported by a fluid that generates motion, flowing in and out through the other fluid connection, and the piston is concentrically with the axis of rotation coaxially with the arc via a lever. It relates to a type in which it is connected to a rotating body arranged and the lever is guided to the rotating body through a sealed gap machined in the direction of movement of the piston in the wall of the annular passage.

  A circular motion piston machine of this type is described in German Utility Model No. 9103452. In this known circular motion piston machine in the form of a hydraulic motor, a piston coupled to a drive device is rotated by a hydraulic load within an annular housing. For this purpose, oil is supplied to the tubular annular inner chamber of the housing via a hydraulic line by means of a hydraulic pump, whereby the advance of the piston is obtained. In order to avoid oil stagnation energy loss that can be caused by oil stagnation between the piston wall and the spool wall, oil is removed in this region by an intervening suction pump via a suction line. This guarantees a continuously uniform piston circular motion. The piston is mounted on a circularly movable piston disk guided from a tubular annular housing through a gap in the radial direction. This piston disk is fixed to the central motor shaft. As the cross-sectional view according to FIG. 2 of said publication shows, both motor halves surrounding the tube annular chamber extend over the entire cross-section of the motor. In this case, the shaft is guided through the motor half. In the configuration shown, the hydraulic pressure inside the cylinder can be dissipated in both directions as well after flowing into the cylinder chamber. In this case, the suction line clearly ends with an oil sump. With this structure, a continuous driving function is not achieved. There is also no mention of sealing. However, this sealing is important for function.

  German patent application 276122 describes a hydraulic motor having a transmission function. This hydraulic motor makes it possible to adjust the specified rotation angle when the rotation speed is low. In this case, with a gear provided on a shaft rotatably supported by the housing as a center, a wedge-shaped tip portion directed to the gear in the radial direction, and a T-shaped configuration provided on the side opposite to the gear Is slidably disposed in a segment sleeve rigidly coupled to the housing. The oil that has entered the cylinder chamber pushes the flat piston into the gear teeth at the wedge-shaped tip. The gear is rotated by the pitch difference between the flat piston and the gear. In this case, a plurality of pistons are always engaged. Uniform rotational motion is generated by the continuous loading of the flat piston, which takes place continuously. In this configuration of the hydraulic motor, a number of flat pistons must be coordinated and moved with respect to each other. In this case, the movement of the flat piston takes place in the radial direction. This structure provided for the specified rotation angle adjustment is relatively labor intensive and is only suitable for relatively slow rotational movements.

  In French patent application publication No. 2500075, a circular orbit cylinder curved in an arc shape and fixed to a central shaft loaded in a hydraulic medium disposed in the circular orbit cylinder. Another hydraulic motor with a piston is shown. A flap is movably supported in the cylinder chamber. This flap is swiveled into a notch in the cylinder wall, thereby releasing the travel of the piston through which it passes. However, this area is not provided with an effective sealing of the piston along the cylinder wall, which does not guarantee a reliable function. In addition, the piston can only pass through the cylinder wall in the inward turning direction of the flap. Furthermore, the piston and flap are subject to high wear. This does not guarantee a permanent function and a high torque. The cylinder chamber is sandwiched between housing halves joined together. Both housing halves have protrusions adjacent to the central axis that protrude radially toward the center of the housing. A gap remains between the two protrusions. The lever arm is guided through this gap. This lever arm is connected on the one hand to the piston and on the other hand to the central shaft. In this case, a sealing element is arranged between the lever arm formed as a disc and the protrusion. The disc-shaped lever arm has a notch for decompression.

  Another circular motion piston machine configured as a metering pump is shown in GB-A-1283907. In this case, a curved piston is supported in two partial circular orbit cylinders located concentrically facing each other. The piston has a curved piston rod connected to it. The piston rod is reciprocated by a central shaft via a lever acting on the piston rod, whereby the liquid is pumped in a precisely metered amount. The piston rod is guided outwardly from each partial circular orbit cylinder on the end face side in accordance with the progress of an arc passing through its cross section, and is connected to a lever outside the cylinder. This structure limits the piston or shaft movement to a relatively small angular range. In this case, the structure mainly has a synchronization function. Furthermore, accurate guide and force transmission between the shaft and the piston becomes difficult, especially at relatively high torques, making the structure unsuitable for transmitting high forces or moments.

  Linearly extended piston / cylinder units for driving purposes, for example to move lever arms in excavators, are also widespread. In this case, the moment and the force acting on the lever arm during the turning motion can be changed, particularly at the support location.

  German Offenlegungsschrift 3900375 describes an internal combustion engine with a piston that moves uniformly and circularly in an annular chamber. In the annular chamber-like cylinder chamber, four work cycles of the internal combustion engine are continuously incorporated. In this case, it is difficult to achieve a precisely controllable movement course over the movement section. Furthermore, the structure requires time-consuming means for controlling combustion and forming a fuel mixture and guiding the exhaust gas. Especially when the movement is slow and the torque is high, it is difficult to properly form such a machine. Therefore, this type of internal combustion engine is irrelevant to the present invention.

  An object of the present invention is to improve a circular motion piston machine provided with a fluid, particularly an incompressible liquid, located in a cylinder chamber so that the movement process can be controlled with high accuracy even when high torque is transmitted. It is to be.

  In order to solve this problem, in the configuration of the present invention, a sealing means is inserted in the gap region between the lever and the wall section adjacent on both sides to prevent fluid outflow.

  According to an advantageous configuration of the invention, the lever is extended along the entire gap length.

  According to an advantageous configuration of the invention, the wall of the annular passage in the gap region is widened on its outer surface.

  According to an advantageous configuration of the invention, the lever and the wall region of the annular passage adjacent to the gap on both sides are provided with complementary holding structures which engage with each other, the holding force of the holding structure Is directed in the opposite direction to the opening of the gap.

  According to an advantageous configuration of the invention, the holding structure provided in the annular passage is formed as a radial protrusion extending along the gap on both sides and is complementary holding structure provided in the lever. However, it is formed as a claw-shaped clamp as seen in the cross-sectional view.

  According to an advantageous configuration of the invention, the lever has the shape of a disk or a sector in plan view, or the annular passage is directly adjacent to the outer peripheral surface of the rotating body.

  According to an advantageous configuration of the invention, the annular passage is formed from two halved shells which are connected to each other with respect to the plane of motion of the piston.

  According to an advantageous configuration of the invention, the rotating body is arranged externally or internally with respect to the annular passage, in particular a central shaft, and the lever is connected to the shaft by a boss, the shaft However, force transmission is generated in both rotation directions, or force transmission is generated only in one rotation direction, and idling is generated in the other rotation direction.

  According to an advantageous configuration of the invention, at least two annular passages are connected to one rotating body, the annular passages being arranged on the opposite radial side of the rotating body and / or It is shifted in the axial direction.

  According to an advantageous configuration of the invention, at least two annular passages are connected to one rotating body and are operated so that the piston operates in phase.

  According to an advantageous configuration of the invention, the fluid connections of the annular passage are connected to one another, so that the return guide of one piston is effected by driving the other piston.

  According to an advantageous configuration of the invention, the dimensions of the piston in the arc direction of the annular passage are adjustable.

  According to an advantageous configuration of the invention, the circular motion piston machine is formed as a unit for reciprocating motion, the connections are mutually controllable for inflow or outflow of fluid, and the gap region The wall of the annular passage in the housing has an increased width, the lever and the wall region of the annular passage adjacent to the gap on both sides are provided with complementary holding structures. The holding force of the holding structure is directed in the direction opposite to the opening of the gap, and the holding structure provided in the annular passage is formed as a radial protrusion extending along the gap on both sides. The complementary holding structure provided on the lever is formed as a claw-like clamp as viewed in cross section.

  According to an advantageous configuration of the invention, the outer rotating body is formed as an outer rotating race and / or the inner rotating body is formed as an inner rotating race, Side and / or upper support structures are provided.

  According to an advantageous configuration of the invention, the rotary body is supported on the housing part of the annular passage by balls or rollers.

  According to an advantageous configuration of the invention, the sealing means are loaded with a pressing force from the side opposite the lever surface.

  According to an advantageous configuration of the invention, two levers with two pistons moving in an annular passage are provided, and a locking device with locking means is provided, each one of which is locked by the locking means. These rotating bodies can be fixed in position together with their associated pistons, and the stationary pistons each form the bottom of a passage for driving the other piston together with the rotating body arranged corresponding to the piston.

  The structure of the present invention provides a stable connection between the piston and the rotating body. A wide range of adaptations can be made to the requirements of the respective purpose of use via the length of the lever and / or the passage cross section or the effective face of the piston. For example, even in the case of high torque for drive purposes, particularly when liquid is used as an incompressible fluid, it is possible to accurately control the course of movement, for example via a program in the control device. When driven, control can be provided by a pump that operates accurately and a switching valve that can be controlled in the desired manner. The piston or passage chamber need not have a circular cross-section, and may actually have any different shape. Also, the lever need not be guided on the side of the passage wall that is located directly opposite the rotating body, and the gap may be arranged, for example, above or below the annular passage. In this case, this annular passage can be formed in the movement plane of the lever in its housing. Subsidized by sealing, a high driving force and an accurate movement process can be obtained.

  An advantageous guide of the lever and sealing of the gap is achieved by extending the lever along the gap length, for example as an annulus or disc, over its entire range of movement.

  Furthermore, an advantageous means for sealing is that the wall of the annular passage in the gap region is widened in the radial direction.

  In addition, the stable and dense structure includes a complementary holding structure in which the lever and the wall region of the annular passage adjacent to the gap on both sides engage with each other, and the holding force of this holding structure. The means that is directed in the direction opposite to the opening of the gap contributes.

  Furthermore, in this case, the holding structure provided in the annular passage is formed as a radial protrusion extending along the gap on both sides, and the complementary holding structure provided on the lever is shown in a cross-sectional view. Advantageously, the means are formed as a claw-like clamp.

  Furthermore, the structure and function are aided by the lever having a disk or sector shape in plan view or the annular passage being directly adjacent to the outer peripheral surface of the rotating body. In order to connect to a rotating body, for example a shaft, shaft ends provided on one side or on both sides in the axial direction can be used.

  For structure and assembly, it is also advantageous if the annular passage is formed from two halved shells that are connected to each other with respect to the plane of motion of the piston. In this case, the two half shells can be screwed together on both sides of the annular passage, preferably with a flange, and may have different outer contours.

  Another different configuration variant is that the rotating body is arranged externally or internally with respect to the annular passage, in particular the central axis, the lever is connected to the axis by a boss, this axis being It can be obtained by generating force transmission in both rotation directions or by generating force transmission only in one rotation direction and causing idle rotation in the other rotation direction.

  Another advantageous means is that at least two pistons which move independently of one another are arranged in one cylinder having 360 ° or at least two annular passages are connected to one rotating body. The annular passage is arranged on the opposite side of the rotor in the radial direction and / or is offset in the axial direction. By means of a plurality of annular passages, for example, the driving moment can be increased or the pumping output can be increased during parallel operation. If at least two annular passages are arranged on the opposite side in the radial direction, a corresponding 360 degree rotation of the rotating body can be achieved in one drive. Due to the additional axial deviation, a structure with different overlaps of the annular passages can be realized.

  Control over a larger angular range is, for example, that at least two pistons that move circularly independently of one another are arranged in one passage having 360 °, or that the pistons work in phase shift. This can be achieved by operating two annular passages connected to one rotating body. In the case of two pistons working independently of each other in one annular passage, each one piston is always prevented from moving relative to the passage by a controllable locking element.

  Another advantageous configuration for motion control is that the fluid connections of the annular passages are connected to each other so that the return guide of one piston is driven by the drive of the other piston. .

  If it is proposed that the dimensions of the piston in the arc direction of the circular track cylinder can be adjusted, then an accurate position adjustment possibility is obtained.

  Furthermore, an advantageous structure for reliable function is that the circular motion piston machine is formed as a unit for reciprocating motion, the connections are mutually controllable for fluid inflow or outflow, The wall of the annular passage in the gap region has an increased width, and the lever and the wall region of the annular passage adjacent to the gap on both sides are provided with complementary holding structures. The holding force of the holding structure is directed in the direction opposite to the opening of the gap, and the holding structure provided in the annular passage is formed as a radial protrusion extending along the gap on both sides. The complementary holding structure provided on the lever is formed as a claw-shaped clamp as seen in the cross-sectional view.

  Another advantageous configuration for a wide variety of possible uses, for example crane slewing bearings, is that the externally arranged rotating body is formed as an outer rotating race and / or the internally disposed rotating body is It is obtained as an inner rotating race and is provided with a lower and / or upper support structure.

  In this case, the advantageous means is that the rotating body is supported on the housing part of the annular passage by balls or rollers.

  For a reliable sealing, the sealing means is contributed by means of a pressing force from the side opposite to the lever surface.

  Another advantageous embodiment is provided with two levers with two pistons moving in an annular passage, provided with a locking device with locking means, each of which is rotated by one of the locking means. The body can be fixed in position with the associated piston, and the stationary pistons each form the bottom of the passage for driving the other piston together with a rotating body arranged corresponding to the piston. .

  An advantageous use case is that a circular piston machine is used as a steering drive for a steered wheel. When a plurality of wheels are steered, a mutually adapted individual control of the steering turning angle of the individual wheels of the vehicle is generated via a control program that can be easily adapted.

  Another advantageous use case is that the circular piston machine is used as a rotary drive for one wheel, whereby a central controller or a distributed controller is provided in the vehicle, for example on each wheel. Individual drive devices can be arranged correspondingly.

It is a schematic sectional plan view of a circular motion piston machine. FIG. 2 is a schematic cross-sectional view of an annular passage of a circular motion piston machine. 2 is a partial view of a circular motion piston machine in the region of connection of shaft-shaped rotors. FIG. It is the schematic of the connection of two annular passages. FIG. 2 is a cross-sectional view of a portion of a circular motion piston machine in the region of connection between one annular passage and a lever extending between the piston and the shaft. It is a partial view of the structural example of the circular motion piston machine provided with the rotary body located outside. It is a fragmentary view of the structural example provided with the rotary body located inside. FIG. 2 is a partial view of a circular motion piston machine in a sealing region. FIG. 5 is a partial view of another embodiment of a circular piston machine with two levers and a common annular passage. FIG. 5 is a partial view of another embodiment of a circular piston machine with two levers and a common annular passage.

  The present invention will be described in detail below with reference to the embodiments shown in the drawings.

  FIG. 1 schematically shows a cross section of a circular motion piston machine perpendicular to a rotating body in the form of a shaft 7. The piston 2 is guided in an annular passage 1 extending along a partial circle of more than 180 °, for example in a circular orbit cylinder, and the movement of the piston by means of a lever 5 formed, for example, as a circular disk, via a boss 6 on a shaft 7. To communicate.

  The piston 2 is moved, for example, as a drive member, preferably by pumping an incompressible fluid through a corresponding fluid connection 3; 4 and withdrawing the fluid through another fluid connection 4; 3. It is done. A boss 6 is fitted to the shaft 7 in order to connect the lever 5 and the shaft. The boss 6 can be formed in various ways, for example, it may be formed to transmit torque to the shaft 7 in one direction and idle in the other direction, or to transmit torque in both directions. May be. With a corresponding structure of only one annular passage 1 and piston 2, it is already possible to cover a relatively large angular range, for example between 180 ° and 320 °, whereby the circular piston drive is reciprocated. It can advantageously be used as a unit for a vehicle, for example for steering individual wheels in a vehicle such as a forklift.

  In one configuration of the circular piston drive, two or more annular passages 1 or circular track cylinders may be provided. These annular passages 1 or circular orbit cylinders are operated in parallel in the same direction or transmit their torque in the opposite direction. In this case, the other lever is operated while idling with respect to the shaft 7. Alternatively, the annular passage 1 may be arranged on the opposite side of the axis in the radial direction, possibly shifted axially with respect to the axis, so that the phases are shifted by the plurality of annular passages 1. It is also possible to realize a continuous rotational movement of the 360 ° axis by control. Also, the same drive unit is controlled by the parallel operation of the annular passage 1 at some times by the corresponding control of the switching valve 11 while the structure of the drive unit remains unchanged by the control device, and is shifted at other times. It can also be controlled by driving. Mixed forms are also possible. That is, the same machine can cover different torque ranges and motion angle ranges.

  Another embodiment is that the two pistons work in the same annular passage chamber. In this case, a separated lever shifted in the axial direction is correspondingly arranged on the piston. As schematically shown in FIG. 3, these levers are coupled to the shaft 7 via freely switchable lock elements, such as claws and bosses. In this way, the pistons can move relative to each other in the cylinder chamber, which results in a drive with appropriate control.

  FIG. 2 shows an axial section of a circular motion piston machine. On the left side, the piston 2 in the annular passage 1 or in the circular orbit cylinder can be seen. In this figure, it is clear how the lever 5 realized, for example, by a circular disc reaches the annular passage 1 and closes the hollow chamber together with the annular passage 1. In this case, the lever 5 is firmly connected to the piston 2.

  FIG. 3 shows a cross section of the circular motion piston machine in the region of the shaft 7 and the boss 6. In this case, the freewheel is formed by a claw 8 and a projection 9 or a locking element in the form of a dentition. In this case, the claw 8 is supported by the protrusion 9 or the steep side surface of the dentition in the driving direction, while the claw 8 slides over the protrusion 9 or the side surface of the dentition in the idling direction. . Such a type of ratchet mechanism may include a double pawl that can turn in both directions, and may be formed so that driving and idling are possible in both directions. For this purpose, correspondingly steep tooth sides and moderately sloped tooth sides are provided on shafts or bosses in different directions, for example offset in the axial direction. Both tooth sides cooperate in this case with the pawls which are also displaced in the axial direction. In order to adjust the claw, for example, a switching magnet or a hydraulic actuator is provided.

  FIG. 4 shows a schematic view for connecting two annular passages 1 to form one circular piston drive. This connection makes it possible to drive the shaft 7 with a constant torque or to pump the fluid with a constant flow by the pump 15 at the corresponding connection to the switching valve 11. For this purpose, the fluid connections 4A, 3B; 3A, 4B are connected via the connecting line 10, whereby one piston (for example 2A) drives the shaft 7 while the other piston (for example 2B) ) Is a return guide. The arrows shown in FIG. 4 indicate directions in which force can be applied to the shaft 7.

  FIG. 5 shows one configuration of a circular motion piston machine. In this configuration, the pressure applied to the wall of the annular passage 1 is received by the claw-shaped clamp 12 attached to the lever 5. This allows the wall to be made significantly thinner than for example without this type of clamp, or the circular piston machine can be designed for significantly higher pressures. In the protrusions on both sides, which are provided in the gap region and are covered by the clamp 12, a sealing element 13, in particular a seal ring, can be advantageously inserted into the gap region against both adjacent lever surfaces.

  The short lever 5 is achieved, for example, by the shaft 7 and the annular passage 1 being adjacent to each other in the gap region and, for example, sealing being performed as shown in FIG.

  Furthermore, it has been proposed that the annular passage 1 is formed in two parts, for example in the middle movement plane of the piston 2, so that the piston 2 and the sealing member 13 can be used without problems. be able to. In this case, for example, a flange for tightening the half shells of the circular track cylinder 1 may be integrally formed on the outer surface of the annular passage 1.

  The base unit of the circular piston machine can be used for different purposes, for example a central or distributed steering drive for a wheel, a rotational drive for a wheel, a hydraulic actuating motor, in combination, for example a cardan shaft. It can be used as a hydraulic pump / motor assembly for imitation and the like.

  FIG. 6 shows one configuration variation for driving a rotating body arranged outside the annular passage 1 or the circular orbit cylinder. In this case, the externally arranged rotating body is arranged in the housing section of the annular passage 1 and also in the upper half of the housing, in this case also by means of ball bearings in addition to a lever formed, for example, as a circular disc It is supported. Correspondingly, the lever 5 in the form of a transmission disc is guided outwardly through a gap provided in the outer peripheral wall of the annular passage 1 and is sealed by sealing means 13 in the gap. In the illustrated example, a rotating body formed as an outer rotating race 20 is attached to the transmission disk, and the rotating body itself includes a support structure 31 positioned above. In this case, the support structure 31 can be assembled with a structure to be rotated, such as a gantry. The support structure 30 on the lower side of the outer rotating race 20 can also be realized without difficulty as long as the corresponding requirements can be satisfied. Also, the housing of the annular passage 1 may be formed in a wide variety of forms and may be coupled to a suitable base for each case. The outer rotating race 20 is supported on the housing of the annular passage 1 through, for example, a four-point support portion. Alternatively, the transmission disk may be guided outwardly through a gap arranged above or below the annular passage 1 (north or south), if necessary, outside the gap. Or may continue to extend horizontally or obliquely outward or inward, for example.

  FIG. 7 shows one configuration of a circular motion piston machine. In this configuration, the rotating body is formed as the inner rotating race 21. Similarly, a support structure 31 positioned above is connected to the inner rotating race 21. In this case, additional bearings have been proposed via ball bearings in the lower region of the section of the annular passage housing. Also in this case, the lower support structure may alternatively be provided on the inner rotating race 21, and the lower support structure 30 may be provided to accommodate the annular passage housing. Alternatively, in this configuration as well, the gap to the lever 5 may be arranged above or below the annular passage 1 as long as it is advantageous. In any case, reliable sealing by the sealing means 13 is required in this case as well.

  FIG. 8 shows a detailed configuration of the sealing means 13. This sealing means 13 is inserted into an annular groove provided in the housing part in the gap region, so as to surround the annular passage 1 with respect to the lever 5 so as to form a reliable sealing in the axial direction and in the radial direction. Designed. For this purpose, the outer surface of the sealing means 13 on the side opposite to the upper surface of the lever 5 accompanied with the crimping pressure is generated via a fluid, for example. This fluid may be the same fluid as the fluid in the annular passage 1. This fluid is supplied through a separate passage. In this case, the hydraulic pressure can be adjusted appropriately and can be ensured, for example, by a valve. Also in the interior of the annular passage, as long as it exists, the transition between the housing parts and the transition between the housing and the piston and / or lever 5 can be sealed by another sealing means. This sealing means is also equipped with an adapted guide surface where necessary. In this case, the crimping can be performed in the above-described format.

  Another configuration of the circular piston machine is shown in FIG. 9A (partial cross-sectional partial plan view) and FIG. 9B (partially cross-sectional partial cross-sectional view). In this arrangement, two separate levers 5, preferably formed as transmission disks, are coupled to two pistons that are driven in the same annular passage 1. In this case, one transmission disk 5 is held by the locking means 16 via, for example, a hydraulic or electromechanical locking system and forms the bottom in the annular passage. A pressure for driving the free transmission disk 5 ′ together with the other piston 2 can be generated on the bottom. Thus, the movable transmission disk 5 'can be designed for a circumference of, for example, about 315 °. Thereafter, the locking means 16 are switched hydraulically or (in a corresponding configuration) electromechanically. The previously driven transmission disk 5 'is fixed together with the piston 2 by correspondingly arranged locking means 16, and the previously fixed transmission disk 5 is unlocked and released. An arbitrary rotation angle is obtained by this mutual switching of the circularly moving pistons 2 with the transmission disks 5, 5 '. For control purposes, as is apparent from FIGS. 9A and 9B, an oil supply 17 and a return passage are preferably formed over the housing, the transmission disk 5; 5 ′ and the piston 2. . This structure can be adapted to different use cases and structures in different ways in conjunction with the rotary body described above.

1 annular passage 2, 2A, 2B piston 3, 3A, 3B fluid connection 4, 4A, 4B fluid connection 5, 5 'transmission disk 6 boss 7 shaft 8 claw 9 projection 10 connecting pipe 11 switching valve 12 clamp 13 seal Element 14 Protruding part 15 Pump 16 Locking means 17 Oil supply part 20 Outer rotating race 21 Inner rotating race 30 Support structure 31 Support structure

Claims (19)

A circular motion piston machine, wherein at least one annular passage (1) curved along at least a partial arc is provided, in which the piston (2) The piston (2) is movably supported by a fluid generating fluid that flows in through the fluid connection (3; 4) and flows out through the other fluid connection (4; 3). (5) is connected to a rotating body concentrically with the rotation axis in concentric relation with the arc, and the lever (5) is connected to the piston (2) on the wall of the annular passage (1). In the form of being guided by a rotating body through a sealed gap machined in the direction of movement of
Circular motion piston machine, characterized in that sealing means (13) are inserted in the gap region between the lever (5) and the adjacent wall sections on both sides to prevent fluid outflow.   2. The circular motion piston machine according to claim 1, wherein the lever (5) is extended along the entire gap length.   3. The circular motion piston machine according to claim 1 or 2, wherein the wall of the annular passage (1) in the gap region is widened on its outer surface.   The lever (5) and the wall region adjacent to the gap on both sides of the annular passage (1) are provided with complementary holding structures that engage with each other, and the holding force of the holding structure is such that the holding force of the gap 4. A circular motion piston machine according to any one of the preceding claims, oriented in the direction opposite to the opening.   The holding structure provided in the annular passage (1) is formed as a radial protrusion (14) extending along the gap on both sides, and a complementary holding structure provided on the lever (5) 5. The circular motion piston machine according to claim 4, formed as a claw-like clamp (12) when viewed in cross-section.   The lever (5) has a disk-like or sector-like shape in plan view or the annular passage (1) is directly adjacent to the outer peripheral surface of the rotating body (7). The circular motion piston machine according to claim 1.   7. The circular motion piston machine according to claim 1, wherein the annular passage is formed by two halved shells connected to each other with respect to the motion plane of the piston. .   The rotating body is arranged externally or internally with respect to the annular passage (1), in particular the central shaft (7), the lever (5) being connected to the shaft (7) by the boss (6). The shaft (7) is configured to generate force transmission in both directions of rotation, or to generate force transmission only in one direction of rotation, and to cause idling in the other direction of rotation. A circular motion piston machine according to any one of the preceding claims.   At least two annular passages (1) are connected to one rotating body, the annular passage (1) being arranged on the opposite side of the rotating body in the radial direction and / or axially offset. A circular motion piston machine according to any one of the preceding claims.   The circular motion piston machine according to claim 9, wherein at least two annular passages (1) are connected to one rotating body and are operated so that the piston operates in phase.   The fluid connections (4.1, 4.2) of the annular passage (1) are connected to each other, whereby the return guide of one piston (2) is performed by driving the other piston (2). 11. A circular motion piston machine according to claim 10, wherein:   12. A circular motion piston machine according to any one of the preceding claims, wherein the dimensions of the piston in the arc direction of the annular passage (1) are adjustable.   The circular motion piston machine is formed as a unit for reciprocating motion, the connections are mutually controllable for inflow or outflow of fluid, the wall of the annular passage (1) in the gap region, The lever (5) and the wall region of the annular passage (1) adjacent to the gap on both sides are provided with complementary holding structures which have an increased width and engage with each other; The holding force of the holding structure is directed in the opposite direction to the opening of the gap, and the holding structure provided in the annular passage (1) extends radially along the gap on both sides (14). The complementary holding structure provided on the lever (5) is formed as a claw-shaped clamp (12) in a cross-sectional view. The circular motion piston machine according to claim 1.   The rotating body arranged outside is formed as an outer rotating race (20) and / or the rotating body arranged inside is formed as an inner rotating race (21), and 14. A circular motion piston machine according to any one of claims 8 to 13, comprising an upper support structure (30, 31).   15. The circular motion piston machine according to claim 8, wherein the rotating body is supported by a ball or a roller on the housing part of the annular passage (1).   The circular motion piston machine according to any one of claims 1 to 15, wherein the sealing means (13) is loaded with a pressing force from the side opposite the lever surface.   Two levers (5) with two pistons (2) moving in the annular passage (1) are provided, a locking device with locking means (16) is provided, and locking means (16 ), The position of one of the rotating bodies can be fixed together with the piston (2) to which it belongs, and the stationary piston (2) is arranged with the other piston (2) corresponding to the piston (2). 17. A circular motion piston machine according to any one of the preceding claims, which forms a passage bottom for driving with a rotating body.   18. Use of the circular motion piston machine according to any one of claims 1 to 17 as a wheel steering drive.   Use of a circular motion piston machine according to any one of claims 1 to 12 as a rotary drive for a single wheel.

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